exam Maths Puzzle Numerical Ability

Mary has 84 coins that have a total value of 5.55$. if all the coins are nickels and dimes. How many of each does mary have?

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exam Other Question

1/r=1/s+1/t....solve for s

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thanks Fast Food. If four out of five doctors prefer fast food, then at a convention of 445 doctors, how many prefer fast food?